Easidew
Dewpoint Transmitter
User’s Manual
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Kahn Instruments, Inc. 2015
This document is the property of Kahn Instruments and may not, either in part or whole, be copied or
otherwise reproduced, communicated in any way to third parties nor stored in any data processing
system, without the written authority of Kahn Instruments, Inc.
Easidew Transmitter User’s Manual
2 Issue 9.1 December 2012
Contents
Safety ................................................................................................................................iii
Electrical Safety ...........................................................................................................iii
Pressure Safety ............................................................................................................iii
Toxic Materials .............................................................................................................iii
Repair and Maintenance ...............................................................................................iii
Calibration ...................................................................................................................iii
Safety Conformity ........................................................................................................iii
Abbreviations ......................................................................................................................iv
Warnings ............................................................................................................................iv
1 INTRODUCTION ................................................................................................1
1.1 Features ............................................................................................................ 1
2 INSTALLATION ..................................................................................................2
2.1 Unpacking the Instrument ................................................................................... 2
2.2 Preparation of the Sensor Cable .......................................................................... 3
2.3 Cable Connection ............................................................................................... 4
2.4 Electrical Schematic ............................................................................................ 4
2.4.1 Electrical Boundaries ..................................................................................... 5
2.5 Transmitter Mounting .......................................................................................... 5
2.5.1 Transmitter Mounting - Sample Block (Optional) .............................................. 6
2.5.2 Transmitter Mounting - Direct Pipeline Connection ........................................... 7
3 OPERATION ......................................................................................................8
4 MAINTENANCE ..................................................................................................9
Figures
Figure 1 Transmitter Unpacking Method ....................................................................2
Figure 2 Connector Terminal Block Removal ..............................................................3
Figure 3 Wiring Connections .....................................................................................3
Figure 4 Connector Installation .................................................................................4
Figure 5 2-Wire Connection Diagram .........................................................................4
Figure 6 Maximum Load of Easidew - Including Cable Resistance ................................5
Figure 7 Transmitter Mounting - Sensor Block ............................................................6
Figure 8 Transmitter Mounting - Pipe or Duct.............................................................7
Figure 9 Installation Location ...................................................................................8
Figure 10 Indication of Dead Space ............................................................................8
Figure 11 Replacement of HDPE Guard .......................................................................9
Figure 12 Dimensions - Easidew ..............................................................................12
Appendices
Appendix A Technical Specications .............................................................................11
Appendix B UL Certication ..........................................................................................13
Appendix C EC Declaration of Conformity ...................................................................... 14
Easidew Transmitter User’s Manual
Kahn Instruments 3
Safety
The manufacturer has designed this equipment to be safe when operated using the procedures
detailed in this manual. The user must not use this equipment for any other purpose than that
stated. Do not apply values greater than the maximum value stated.
This manual contains operating and safety instructions, which must be followed to ensure the safe
operation and to maintain the equipment in a safe condition. The safety instructions are either
warnings or cautions issued to protect the user and the equipment from injury or damage. Use
competent personnel using good engineering practice for all procedures in this manual.
Electrical Safety
The instrument is designed to be completely safe when used with options and accessories supplied
by the manufacturer for use with the instrument.
Pressure Safety
DO NOT permit pressures greater than the safe working pressure to be applied to the instrument.
The specied safe working pressure is 5000 psig. Refer to the Technical Specications in Appendix A.
Easidew Transmitter User’s Manual
4 Issue 9.1 December 2012
Abbreviations
The following abbreviations are used in this manual:
barg pressure unit (=100 kP or 0.987 atm) gauge
ºC degrees Celsius
ºF degrees Fahrenheit
DC direct current
ft-lbs foot-pound force
g grams
in inch(es)
µm micrometer
m/sec meters per second
mA milliampere
max maximum
mm millimetres
MPa megapascal
Nl/min normal liters per minute
Nm Newton meter
oz ounces
ppm
V
parts per million by volume
psig pounds per square inch
RH relative humidity
scfh standard cubic feet per hour
scfs standard cubic feet per second
T temperature
V Volts
Ω Ohms
ø diameter
Warnings
The following general warning listed below is applicable to this instrument. It is repeated
in the text in the appropriate locations.
Where this hazard warning symbol appears in the following
sections it is used to indicate areas where potentially hazardous
operations need to be carried out.
Easidew Transmitter User’s Manual
Kahn Instruments 1
INTRODUCTION
1 INTRODUCTION
The Easidew dew-point transmitter has been manufactured, tested and calibrated to the
highest available standards and should be in good working order, ready for installation
into a gas measurement application. If there are any questions about the instrument or
how to install and operate it, please contact a Kahn representative (for Kahn Instruments’
contact information go to www.kahn.com).
1.1 Features
The Easidew dew-point transmitter is a continuous on line 4-20mA transmitter for the
measurement of moisture content in air and other non-corrosive gases. The key features
are:
• 4-20 mA 2-wire loop powered connection
• Dew-point OR parts per million (moisture content) in volume (ppmV)
measurements
• Accuracy (±3.6ºFdp (±2ºCdp))
• Repeatability (0.9ºFdp (0.5ºCdp))
• Dew-point values traceable to international standards (NIST)
• Excellent sensor protection (rugged 316 stainless steel NEMA 4
construction)
• Interchangeability
Easidew Transmitter User’s Manual
2 Issue 9.1 December 2012
INSTALLATION
2 INSTALLATION
2.1 Unpacking the Instrument
On delivery, please check that all the following standard components are in the packing
box:
• Easidew Transmitter
• Bonded Seal
• Certicate of Calibration
• Connector (for sensor/cable)
Unpack the dew-point transmitter box as follows:
87653 421
Figure 1
Transmitter Unpacking Method
1. Remove the cap (1) from the packing tube (8).
2. Remove the foam block (3) containing the connector (2).
3. Pull out the transmitter (5) from the tube, complete with the two foam
covers (6) and (7) and the red protective cap (4).
4. Remove the foam covers from the transmitter but leave the blue plastic
protective cover (5) and the red cap (4) in place until ready for installation.
NOTE: The transmitter sensing element is protected while in transit by a blue
cover containing a small desiccant capsule. The connection pins are protected
by a red plastic cap. These plastic items must be removed for the operation
of the transmitter.
NOTE: Keep the connector (2) in a safe place until the transmitter is ready
for wiring.
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